Runway-embedded flash lighting device and heat conducting member

ABSTRACT

A runway-embedded flash lighting device, includes a body configured to be embedded in a runway; a ceiling member including a flash emission window and disposed in an upper opening of the body and configured to be exposed to a runway surface when the body is embedded in the runway; a light guide member disposed in the flash emission window; an LED flash light source disposed inside the body and configured to emit a flash toward the light guide member; and a heat conducting member, wherein the light guide is configured to allow the flash emitted from the LED flash light source to be emitted from the flash emission window , the heat conducting member is disposed inside the body and includes a first part in contact with the LED flash light source, and a second part in contact with the ceiling member.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No.PCT/JP2019/032554filed Aug. 21, 2019, claiming priority based onJapanese Patent Application No. 2018-201400filed Oct. 26, 2018.

TECHNICAL FIELD

The present invention relates to a runway-embedded flash lighting deviceand a heat conducting member.

BACKGROUND ART

Conventionally, marker lamps for emitting marker light have beenembedded under an airfield runway as a guide sign (for example, seePatent Literature 1). In the marker lamp embedded under an airfieldrunway, a discharge lamp containing xenon is sometimes used as a flashlight source.

CITATION LIST Patent Literature

Patent Literature 1: JP 2000-228103 A

SUMMARY OF INVENTION Technical Problem

However, a flash lighting device using a xenon flash light source isheavy, has a short life, has a low effective luminous intensity, cannotswitch the luminous intensity among high luminous intensity, mediumluminous intensity, and low luminous intensity, and consumes a largeamount of power. In addition, a runway-embedded flash lighting device isrequired to be excellent in heat dissipation of the heat generated by aflash light source.

With the foregoing in mind, it is an object of the present invention toprovide a new runway-embedded flash lighting device that is light, has along life, has high effective luminous intensity, can switch theluminous intensity, is low in power dissipation, and is excellent inheat dissipation.

Solution to Problem

In order to achieve the above object, according to one aspect of thepresent invention there is provided a runway-embedded flash lightingdevice, which includes: a cylindrical body; a ceiling member; a lightguide member; an LED flash light source; and a heat conducting member,wherein the cylindrical body can be embedded in a runway, the ceilingmember is placed in an upper opening of the cylindrical body in a stateof being able to be exposed to a runway surface when the cylindricalbody is embedded in the runway, the ceiling member is provided with aflash emission window, the light guide member is placed in the flashemission window, the LED flash light source is placed inside thecylindrical body in a state of capable of emitting flash toward thelight guide member placed in the flash emission window, the light guidemember allows flash emitted from the LED flash light source to beemitted to an outside from the flash emission window, the heatconducting member is placed inside the cylindrical body, a part of theheat conducting member is in contact with the LED flash light source,and at least a part of a rest of the heat conducting member is incontact with the ceiling member.

Advantageous Effects of Invention

The runway-embedded flash lighting device of the present invention islight, has a long life, has high effective luminous intensity, canswitch the luminous intensity, is low in power dissipation, and isexcellent in heat dissipation.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an exploded perspective view showing the configuration of anexample of the runway-embedded flash lighting device according to thefirst example embodiment.

FIG. 2 is a perspective view from above showing an example of thecylindrical body and ceiling member in the runway-embedded flashlighting device according to the first example embodiment.

FIG. 3 is a perspective view from below showing an example of thecylindrical body and ceiling member in the runway-embedded flashlighting device according to the first example embodiment.

FIG. 4 is a perspective view from below showing an example of thecylindrical body, ceiling member, and heat conducting member in therunway-embedded flash lighting device according to the first exampleembodiment.

FIG. 5 is a partially enlarged perspective view showing an example ofthe LED flash light source in the runway-embedded flash lighting deviceaccording to the first example embodiment.

FIG. 6 is a cross-sectional view illustrating an example of the LEDflash light source in the runway-embedded flash lighting deviceaccording to the first example embodiment.

FIG. 7 is an exploded perspective view showing the configuration of anexample of the runway-embedded flash lighting device according to thesecond example embodiment.

FIG. 8 is a perspective view from below showing the runway-embeddedflash lighting device shown in FIG. 7.

FIG. 9 is a side view showing an example of the bottom cover member ofthe runway-embedded flash lighting device according to the secondexample embodiment.

FIG. 10 is a schematic perspective view showing the configuration of anexample of the runway according to the fourth example embodiment.

FIG. 11 is a schematic side view explaining flash emission in therunway-embedded flash lighting device according to the first exampleembodiment.

FIG. 12 is a side view showing an example of the light guide member andLED flash light source inside the runway-embedded flash lighting deviceshown in FIG. 11.

DESCRIPTION OF EMBODIMENTS

Next, example embodiments of the present invention will be describedwith reference to FIGS. 1 to 12. The present invention, however, is notlimited or restricted to the following example embodiments by any means.In FIGS. 1 to 12, identical parts are indicated with identical referencesigns. Regarding the descriptions of the example embodiments, referencecan be made to one another. Furthermore, in the drawings, for ease ofdescription, illustration of the structures of the components may beappropriately simplified, and the size, the ratio, and the like ofcomponents may be schematically shown and different from actual ones.

First Example Embodiment

FIG. 1 is an exploded perspective view showing the configuration of anexample of the runway-embedded flash lighting device according to thepresent example embodiment. As shown in FIG. 1, a runway-embedded flashlighting device 1 includes a cylindrical body 10, a ceiling member 11, alight guide member 12, an LED flash light source 13, and a heatconducting member 17.

The cylindrical body 10 can be embedded in a runway 2 as will bedescribed below with reference to FIG. 10 in the fourth exampleembodiment. The cylindrical body 10 may be, for example, a circularcylinder as shown in FIG. 1, or may be a cylinder other than a circularcylinder such as an elliptical cylinder or a polygonal cylinder.

The ceiling member 11 is placed in the upper opening of the cylindricalbody 10 in a state of being able to be exposed to the runway surfacewhen the cylindrical body 10 is embedded in the runway 2.

The cylindrical body 10 and the ceiling member 11 may be separatemembers as shown in FIG. 1, or may be integrally molded as an integrallymolded product as shown in FIG. 2. Examples of the integrally moldedproduct include aluminum castings, titanium castings, aluminum alloycastings, and titanium alloy castings. Among them, aluminum castings andtitanium castings are preferable because they are light, and aluminumcastings are particularly preferable because they are inexpensive. Whenthe cylindrical body 10 and the ceiling member 11 are separate members,as in the case of the integrated molding product, the cylindrical body10 and ceiling member 11 may be, for example, aluminum castings,titanium castings, aluminum alloy castings, or titanium alloy castings.

The ceiling member 11 is provided with a flash emission window, and thelight guide member 12 is placed in the flash emission window. Therunway-embedded flash lighting device 1 of the present exampleembodiment may include two or more flash emission windows, and the lightguide member 12 may be placed in each of the flash emission windows, forexample. If two or more light guide members 12 are used, the burden onthe light guide member 12 can be further reduced and damage can beprevented. For example, as shown in FIG. 1, the flash emission windowand the light guide member 12 may be divided into two or more by areinforcing plate member 14 to be described below. The light guidemember 12 may be, for example, a prism lens or the like. The material ofthe prism lens is not particularly limited, and may be, for example,glass or the like.

The ceiling member 11 may have a stepped structure that includes anupper ceiling portion 11 a and a lower ceiling portion 11 b, wherein theupper ceiling portion 11 a is placed on the rear side relative to theemission direction of the flash emission window, and the lower ceilingportion 11 b is placed on the emission direction side of the flashemission window, for example.

The runway-embedded flash lighting device 1 of the present exampleembodiment may further include the reinforcing plate member 14, and thereinforcing plate member 14 may be placed on the outer surface of thelower ceiling portion 11 b in a state of standing upright in thevertical direction of the outer surface of the lower ceiling portion 11b, for example. The ceiling member 11 and the reinforcing plate member14 may be separate members or may be integrally molded as an integrallymolded product, for example. When the ceiling member 11 and thereinforcing plate member 14 are separate members, as in the case of theintegrated molding product, the reinforcing plate member 14 may be, forexample, aluminum castings, titanium castings, aluminum alloy castings,or titanium alloy castings.

The runway-embedded flash lighting device 1 of the present exampleembodiment may further include a fixing member 15, the fixing member 15may be placed on the outer peripheral side of the ceiling member 11, andthe fixing member 15 may be provided with a screw hole to be insertedwith a screw for fixing to the runway 2, for example. The fixing member15 may have a tapered shape in which the outer surface is inclined so asto be thinner toward the outer periphery, for example. The ceilingmember 11 and the fixing member 15 may be, for example, separate membersor may be integrally molded as an integrally molded product. When theceiling member 11 and the fixing member 15 are separate members, as inthe case of the integrated molding product, the fixing member 15 may be,for example, aluminum castings, titanium castings, aluminum alloycastings, or titanium alloy castings. At least one of the ceiling member11 and the fixing member 15 may have a hole through which therunway-embedded flash lighting device 1 is pulled up by a tool.

The LED flash light source 13 is placed inside the cylindrical body 10in a state of capable of emitting flash toward the light guide member 12placed in the flash emission window. FIG. 3 is a perspective view frombelow showing an example of the cylindrical body 10 and ceiling member11. For example, as shown in FIG. 3, the inner surface of the ceilingmember 11 (the surface on the cylindrical body 10 side) may be providedwith a site to be placed with the LED flash light source 13 below theflash emission window. The light guide member 12 allows flash emittedfrom the LED flash light source 13 to be emitted to the outside from theflash emission window.

The LED flash light source 13 may be, for example, an LED module or thelike. The

LED flash light source 13 includes a substrate 13 a and an LED 13 b, andthe LED 13 b is placed on the substrate 13 a as shown in FIG. 1, forexample. While the number of the LED flash light sources 13 is two inthe example shown in FIG. 1, the number of LED flash light sources 13may be one or three or more.

The conditions for mounting the LED 13 b on the substrate 13 a is notparticularly limited, and can be appropriately set according to thedesired optical properties. FIG. 1 shows an example in which 4×9=36matrixes are two, i.e., seventy-two LEDs 13 b are mounted on thesubstrate 13 a.

The shape of the LED 13 b is not particularly limited, and is generallya square shape or a rectangular shape. The size of the LED 13 b is notparticularly limited, and in the case of a square, the length of oneside is, for example, 1.8 to 2.2 mm, 3 to 3.5 mm, or 4 to 5.3 mm, and inthe case of a rectangle, the length of the short side is, for example,the same as the length of the square, and the ratio of the short side tothe long side is, for example, 1:1 to 3. On the surface of the substrate13 a to which the LEDs 13 b are mounted, the width between the adjacentLEDs is, for example, 0.2 to 0.5 mm

The LED flash light source 13 may include a lens member 13 c, the lensmember 13 c may be placed above the LED 13 b, and the lens member 13 cmay be a lens member that allows the emission surface of flash emittedfrom the LED 13 b to have a uniform illuminance distribution, forexample, as shown in the partially enlarged perspective view of FIG. 5and the cross-sectional view of FIG. 6. Examples of the lens member 13 cinclude a fly-eye lens and an integrator lens. For example, as shown inFIG. 6, by dividing the lens member 13 c into two or more pieces so asnot to become too large, the burden on the lens member 13 c can befurther reduced and damage can be prevented. It is preferable that thelens member 13 c be not too small so as not to cause loss in extractionof the emitted flash.

The heat conducting member 17 is placed inside the cylindrical body 10,wherein a part of the heat conducting member 17 is in contact with theLED flash light source 13 and at least a part of the rest of the heatconducting member 17 is in contact with the ceiling member 11. Thus, theheat generated by the LED flash light source 13 can be transmitted tothe ceiling member 11 through the heat conducting member 17 to radiateheat to the outside of the device 1. The runway-embedded flash lightingdevice 1 of the present example embodiment is excellent in heatdissipation as compared to the case of radiating heat inside the device1.

The heat conducting member 17 is partially in contact with the surfaceof the substrate 13 a opposite to the LED 13 b mounting side, forexample, as shown in FIG. 1. At least a part of the rest of the heatconducting member 17 may be in contact with the ceiling member 11, andcan be in contact with any part of the ceiling member 11. For example,as shown in FIG. 1, at least a part of the rest of the heat conductingmember 17 may be in contact with the ceiling member 11 on the flashemission side relative to the flash emission window. In this aspect, forexample, at least a part of the rest of the heat conducting member 17may be in contact with the lower ceiling portion 11 b. In the aspectshown in FIG. 1, the heat generated by the LED flash light source 13 canbe transmitted to the flash emission side relative to the flash emissionwindow through the heat conducting member 17, and it is possible to meltthe accumulated snow that blocks the flash emission in an airfieldrunway in a cold region, for example. For example, as shown in FIG. 3,the inner surface of the ceiling member 11 (the surface on thecylindrical body 10 side) may be provided with a site to be placed withthe heat conducting member 17 in addition to the site to be placed withthe LED flash light source 13.

Examples of the heat conducting member 17 include a plate-like heat sinkand a heat pipe, and a self-made heat conducting member or acommercially available heat conducting member may be used. Examples ofthe material of the plate-like heat sink include copper and aluminum.The material of the heat pipe is not particularly limited and may be aknown heat conductive material, and a specific example of the materialis metal or the like. Examples of the metal include aluminum and itsalloys, magnesium and its alloys, iron and its alloys, copper and itsalloys, titanium and its alloys, molybdenum and its alloys, and tungstenand its alloys. FIG. 4 is a perspective view from below showing anexample of the cylindrical body, ceiling member, and heat conductingmember in the runway-embedded flash lighting device of the presentexample embodiment. The heat conducting member 17 may include theplate-like heat sink 17 a and the heat pipe 17 b, a part of one surfaceof the plate-like heat sink 17 a may be in contact with the LED flashlight source 13, at least a part of the rest of the one surface of theplate-like heat sink 17 a may be in contact with the lower ceilingportion 11 b, and the heat pipe 17 b may be attached to the plate-likeheat sink 17 a in a state where one end side of which is located on theLED flash light source 13 side and the other end side is located on thelower ceiling portion 11 b side, for example. While FIG. 4 shows anexample in which the heat pipe 17 b is attached to the other surface ofthe plate-like heat sink 17 a (the surface opposite to the surface (onesurface) in contact with the LED flash light source 13), the heat pipe17 b may be attached to one surface of the plate-like heat sink 17 a ormay be attached to both of one surface and the other surface of theplate-like heat sink 17 a. In the aspect shown in FIG. 4, the heat pipe17 b may be placed by, for example, soldering or the like by notchingthe plate-like heat sink 17 a in the thickness direction and embeddingit therein.

The heat pipe 17 b may have a first straight portion extending in adirection perpendicular to the emission direction (arrow X direction)and a second straight portion extending in the emission direction,wherein the first straight portion and the second straight portion maybe coupled to form an L-shape as a whole, the one end side may have thefirst straight portion, and the other end side may have the secondstraight portion, for example, as shown in FIG. 4.

It is preferable that an upward flash having an angle a of about 3degrees with respect to a direction parallel to the runway surface beemitted from the runway-embedded flash lighting device 1 of the presentexample embodiment, for example, as shown in FIG. 11. The light guidemember 12 and the LED flash light source 13 inside the runway-embeddedflash lighting device 1 shown in FIG. 11 can be shown as in FIG. 12.

While the weight of a flash lighting device using a xenon flash lightsource is 65 kg or less, specifically, about 40 kg, the weight of therunway-embedded flash lighting device 1 of the present exampleembodiment is, for example, 18 kg or less, specifically, about 11 kg.Thus, according to the present example embodiment, it is possible toprovide a light runway-embedded flash lighting device.

While the lifetime of a flash lighting device using a xenon flash lightsource is about 500 hours, the runway-embedded flash lighting device 1of the present example embodiment can be used indefinitely, for example.Thus, according to the present example embodiment, it is possible toprovide a runway-embedded flash lighting device having a long life.

While the effective luminous intensity of a flash lighting device usinga xenon flash light source is 1000 cd or more, specifically about 1200cd, the effective luminous intensity of the runway-embedded flashlighting device 1 of the present example embodiment is, for example,6000 cd or more, specifically about 7000 cd. Thus, according to thepresent example embodiment, it is possible to provide a runway-embeddedflash lighting device having a high effective luminous intensity.

While a flash lighting device using a xenon flash light source cannotswitch the luminous intensity among high luminous intensity, mediumluminous intensity, and low luminous intensity, since therunway-embedded flash lighting device 1 of the present exampleembodiment has high effective luminous intensity as described above, itcan switch the luminous intensity among high luminous intensity (e.g.,6000 cd or more), medium luminous intensity (e.g., 1000 cd or more), andlow luminous intensity (e.g., 250 cd or more), for example. Thus,according to the present example embodiment, it is possible to provide arunway-embedded flash lighting device that can switch the luminousintensity. The high luminous intensity is used, for example, in thedaytime of poor visibility due to fog, rain, or the like, the lowluminous intensity is used, for example, in the night, and the mediumluminous intensity is used, for example, in the evening.

While the power dissipation of a flash lighting device using a xenonflash light source is about 500 W, the power dissipation of therunway-embedded flash lighting device 1 of the present exampleembodiment is, for example, about 80 W (up to 114 W at high luminousintensity, 31 W at medium luminous intensity, 24 W at low luminousintensity). Thus, according to the present example embodiment, it ispossible to provide a runway-embedded flash lighting device that is lowin power dissipation.

Second Example Embodiment

FIG. 7 is an exploded perspective view showing the configuration of anexample of the runway-embedded flash lighting device of the presentexample embodiment. FIG.8 is a perspective view from below showing therunway-embedded flash lighting device shown in FIG. 7. As shown in FIGS.7 and 8, the runway-embedded flash lighting device 1 of the presentexample embodiment is the same as the runway-embedded flash lightingdevice 1 of the first example embodiment except that it includes abottom cover member 16.

The bottom cover member 16 is placed in a state of closing the loweropening of the cylindrical body 10. Examples of the material of thebottom cover member 16 include aluminum, titanium, aluminum alloy,titanium alloy, and castings thereof.

FIG. 9 is a side view showing an example of the bottom cover member 16.For example, as shown in FIG. 9, the bottom cover member 16 may includea cable gland 16 a and an external ground terminal 16 b. Further, whenthe bottom cover member 16 is attached to at least one of thecylindrical body 10 and the LED flash light source 13 with a screw 16 cand an O-ring (not shown), for example, the runway-embedded flashlighting device 1 can be waterproof

Third Example Embodiment

According to the present invention, it is possible to provide the heatconducting member 17 for use in the runway-embedded flash lightingdevice 1 of the first or second example embodiment. The heat conductingmember 17 of the present invention may include at least one of theplate-like heat sink 17 a and the heat pipe 17 b. Regarding the heatconducting member 17 of the present invention, reference can be made tothe descriptions of the first and second example embodiments.

Fourth Example Embodiment

FIG. 10 is a schematic perspective view showing the configuration of anexample of the runway of the present example embodiment. While therunway is shown schematically simplified in FIG. 10, the runway 2 is onein which the runway-embedded flash lighting device 1 of the first orsecond example embodiment is embedded with the ceiling member 11exposed.

While the present invention has been described above with reference toillustrative example embodiments, the present invention is by no meanslimited thereto. Various changes and variations that may become apparentto those skilled in the art may be made in the configuration andspecifics of the present invention without departing from the scope ofthe present invention.

Supplementary Notes

A part of or the whole of the above-described example embodiments can bedescribed as the following supplementary notes. However, the presentinvention is by no means limited thereto.

(Supplementary Note 1)

A runway-embedded flash lighting device including:

a cylindrical body;

a ceiling member;

a light guide member;

an LED flash light source; and

a heat conducting member, wherein

the cylindrical body can be embedded in a runway,

the ceiling member is placed in an upper opening of the cylindrical bodyin a state of being able to be exposed to a runway surface when thecylindrical body is embedded in the runway,

the ceiling member is provided with a flash emission window,

the light guide member is placed in the flash emission window,

the LED flash light source is placed inside the cylindrical body in astate of capable of emitting flash toward the light guide member placedin the flash emission window,

the light guide member allows flash emitted from the LED flash lightsource to be emitted to an outside from the flash emission window,

the heat conducting member is placed inside the cylindrical body,

a part of the heat conducting member is in contact with the LED flashlight source, and

at least a part of a rest of the heat conducting member is in contactwith the ceiling member.

(Supplementary Note 2)

The runway-embedded flash lighting device according to SupplementaryNote 1, wherein

at least a part of the rest of the heat conducting member is in contactwith the ceiling member on a flash emission side relative to the flashemission window.

(Supplementary Note 3)

The runway-embedded flash lighting device according to SupplementaryNote 1 or 2, wherein

the LED flash light source includes:

-   -   a substrate;    -   an LED; and    -   a lens member,

the LED is placed on the substrate,

the lens member is placed above the LED,

the lens member is a lens member that allows an emission surface offlash emitted from the LED to have a uniform illuminance distribution,and

a part of the heat conducting member is in contact with a surface of thesubstrate opposite to an LED mounting side.

(Supplementary Note 4)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 3, wherein

the ceiling member includes an upper ceiling portion and a lower ceilingportion,

the upper ceiling portion is placed on a rear side relative to anemission direction of the flash emission window,

the lower ceiling portion is placed on an emission direction side of theflash emission window, and

at least a part of the rest of the heat conducting member is in contactwith the lower ceiling portion.

(Supplementary Note 5)

The runway-embedded flash lighting device according to SupplementaryNote 4, further including:

a reinforcing plate member, wherein

the reinforcing plate member is placed on an outer surface of the lowerceiling portion in a state of standing upright in a vertical directionof the outer surface of the lower ceiling portion.

(Supplementary Note 6)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 5, wherein

the heat conducting member includes at least one of a plate-like heatsink or a heat pipe.

(Supplementary Note 7)

The runway-embedded flash lighting device according to SupplementaryNote 6, wherein

the heat conducting member includes a plate-like heat sink and a heatpipe,

a part of one surface of the plate-like heat sink is in contact with theLED flash light source,

at least a part of a rest of the one surface of the plate-like heat sinkis in contact with the lower ceiling portion, and

the heat pipe is attached to the plate-like heat sink in a state whereone end side of which is located on an LED flash light source side andthe other end side is located on a lower ceiling portion side.

(Supplementary Note 8)

The runway-embedded flash lighting device according to SupplementaryNote 7, wherein

the heat pipe has a first straight portion extending in a directionperpendicular to the emission direction and a second straight portionextending in the emission direction, the first straight portion and thesecond straight portion are coupled to form an L-shape as a whole, theone end side has the first straight portion, and the other end side hasthe second straight portion.

(Supplementary Note 9)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 8, further including:

a fixing member, wherein

the fixing member is placed on an outer peripheral portion of theceiling member, and

the fixing member is provided with a screw hole to be inserted with ascrew for fixing to the runway.

(Supplementary Note 10)

The runway-embedded flash lighting device according Supplementary Note9, wherein

the ceiling member and the fixing member are integrally molded as anintegrally molded product.

(Supplementary Note 11)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 10, wherein

the cylindrical body and the ceiling member are integrally molded as anintegrally molded product.

(Supplementary Note 12)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 11, including:

two or more flash emission windows, wherein

the light guide member is placed in each of the flash emission windows.

(Supplementary Note 13)

The runway-embedded flash lighting device according to any one ofSupplementary Notes 1 to 12, further including:

a bottom cover member, wherein

the bottom cover member is placed in a state of closing a lower openingof the cylindrical body.

(Supplementary Note 14)

The runway-embedded flash lighting device according to SupplementaryNote 13, wherein the bottom cover member includes a cable gland and anexternal ground terminal.

(Supplementary Note 15)

A heat conducting member for use in the runway-embedded flash lightingdevice according to any one of Supplementary Notes 1 to 14.

(Supplementary Note 16)

The heat conducting member according to Supplementary Note 15,including: at least one of a plate-like heat sink or a heat pipe.

(Supplementary Note 17)

A runway with the runway-embedded flash lighting device according to anyone of Supplementary Notes 1 to 14.

This application claims priority from Japanese Patent Application No.2018-201400 filed on Oct. 26, 2018. The entire subject matter of theJapanese Patent Application is incorporated herein by reference.

INDUSTRIAL APPLICABILITY

The present invention can provide a new runway-embedded flash lightingdevice that is light, has a long life, has high effective luminousintensity, can switch the luminous intensity, is low in powerdissipation, and is excellent in heat dissipation.

REFERENCE SIGNS LIST

-   1: runway-embedded flash lighting device-   2: runway-   10: cylindrical body-   11: ceiling member-   11 a: upper ceiling portion-   11 b: lower ceiling portion-   12: light guide member-   13: LED flash light source-   13 a: substrate-   13 b: LED-   13 c: lens member-   14: reinforcing plate member-   15: fixing member-   16: bottom cover member-   16 a: cable gland-   16 b: external ground terminal-   16 c: screw-   17: heat conducting member

17 a: plate-like heat sink

-   17 b: heat pipe

The invention claimed is:
 1. A runway-embedded flash lighting device,comprising: a body; a ceiling member; a bottom cover member; a lightguide member; an LED flash light source; and a heat conducting member,wherein the body is configured to be embedded in a runway, the ceilingmember is disposed in an upper opening of the body and configured to beexposed to a runway surface when the body is embedded in the runway, theceiling member has a stepped structure that includes an upper ceilingportion and a lower ceiling portion, and comprises a flash emissionwindow, the upper ceiling portion is disposed on a rear side relative toan emission direction of the flash emission window, and the lowerceiling portion is disposed on an emission direction side of the flashemission window, the flash emission window and the light guide memberare divided into two or more by a reinforcing plate member, thereinforcing plate member is disposed on the outer surface of the lowerceiling portion in a state of standing upright in the vertical directionof the outer surface of the lower ceiling portion, the bottom covermember is placed in a state of closing the lower opening of the body,the light guide member is disposed in the flash emission window, the LEDflash light source is disposed inside the body and configured to emit aflash toward the light guide member, the light guide member isconfigured to allow the flash emitted from the LED flash light source tobe emitted from the flash emission window to outside the runway-embeddedflash lighting device, the heat conducting member is disposed inside thebody and comprises a first part and a second part, the first part of theheat conducting member is in contact with the LED flash light source,and the second part of the heat conducting member is in contact with theceiling member.
 2. The runway-embedded flash lighting device accordingto claim 1, wherein the second part of the heat conducting member is incontact with the ceiling member on a flash emission side relative to theflash emission window.
 3. The runway-embedded flash lighting deviceaccording to claim 1, wherein the LED flash light source comprises: asubstrate; an LED; and a lens member, the LED is disposed on thesubstrate, the lens member is disposed above the LED, the lens member isconfigured to produce an emission surface of flash emitted from the LEDwith a uniform illuminance distribution, and a part of the heatconducting member is in contact with a surface of the substrate oppositeto an LED mounting side of the substrate.
 4. The runway-embedded flashlighting device according to claim 3, wherein the ceiling membercomprises an upper ceiling portion and a lower ceiling portion, theupper ceiling portion is disposed on a rear side relative to an emissiondirection of the flash emission window, the lower ceiling portion isdisposed on an emission direction side of the flash emission window, andthe second part of the heat conducting member is in contact with thelower ceiling portion.
 5. The runway-embedded flash lighting deviceaccording to claim 1, wherein the heat conducting member comprises atleast one of a plate-like heat sink and a heat pipe.
 6. Therunway-embedded flash lighting device according to claim 1, wherein theheat conducting member comprises a plate-like heat sink and a heat pipe,a first part of one surface of the plate-like heat sink is in contactwith the LED flash light source, a second part of the one surface of theplate-like heat sink is in contact with the lower ceiling portion, andthe heat pipe is attached to the plate-like heat sink in a state wherethe heat pipe is located on a lower ceiling portion side of theplate-like heat sink.
 7. The runway-embedded flash lighting deviceaccording to claim 6, wherein the heat pipe has a first straight portionextending in a direction perpendicular to an emission direction of theflash and a second straight portion extending in the emission directionof the flash, the first straight portion and the second straight portionare coupled to form an L-shape as a whole, the one end side comprisesthe first straight portion, and the other end side comprises the secondstraight portion.
 8. The runway-embedded flash lighting device accordingto claim 1, further comprising: a fixing member, wherein the fixingmember is placed on an outer peripheral portion of the ceiling member,and the fixing member is provided with a fastener hole configured forinsertion of a fastening for fixing the ceiling member to the runway. 9.A heat conducting member for use in the runway-embedded flash lightingdevice according to claim
 1. 10. The heat conducting member according toclaim 9, comprising: at least one of a plate-like heat sink or a heatpipe.
 11. The heat conducting member according to claim 1, wherein thebody is cylindrical in shape.
 12. The heat conducting member accordingto claim 8, wherein the fastener is a screw.